BLS Factory Breitling Navitimer B01 Chronograph 43mm Watch
The BLS Factory Breitling Navitimer B01 Chronograph combines a 43mm case with a 7750-based B01-style automatic chronograph movement, three-register dial layout and date display at 6 o’clock.
The dial retains one of the Navitimer’s most recognizable technical elements: a circular aviation slide rule positioned around the outer section of the display.
Baton-style hour markers, three chronograph registers and a fluted bezel complete the aviation-instrument-inspired layout while maintaining clear separation between the different timing indications.
43mm Case
The BLS Factory Navitimer B01 Chronograph features a 43mm case diameter.
The larger dial area is particularly relevant to the Navitimer architecture because the watch combines conventional time indications, three chronograph registers, a date display and an outer circular slide-rule scale.
The 43mm format provides enough surface area for these elements to remain visually separated.
No confirmed case thickness or material was supplied, so those specifications are not added.
7750-Based B01-Style Automatic Movement
This configuration uses a 7750-based automatic chronograph movement modified with a B01-style architecture and appearance.
The movement provides automatic winding together with mechanical chronograph functionality.
Normal wrist movement contributes to replenishing the movement’s stored energy during regular wear.
Because the supplied technical information identifies the underlying movement as a modified 7750, this page does not describe it as an original Breitling Manufacture Caliber B01.
Mechanical Chronograph
The watch incorporates a mechanical chronograph function for measuring elapsed time.
Chronograph operation is integrated into the automatic movement and displayed through the dedicated counters on the dial.
The timing mechanism can be started, stopped and reset through the corresponding chronograph controls.
As with other mechanical chronographs, the pushers should be operated normally and never forced if unusual resistance is encountered.
Three-Register Dial Layout
The dial uses a recognizable three-register chronograph layout.
The three subdials divide the chronograph and supporting indications into separate areas while leaving the central hands available for the primary time display.
This multi-register architecture is one of the defining visual characteristics of the Navitimer Chronograph.
Exact individual subdial functions and positions were not included in the supplied information, so unverified assignments are not added.
Date Display at 6 O’Clock
A date window is positioned at 6 o’clock.
Placing the calendar indication at the lower portion of the dial integrates it with the symmetrical three-register arrangement without requiring an additional display at the side of the dial.
The date mechanism operates as part of the automatic movement configuration.
When manually correcting the calendar, avoid forcing the mechanism if unusual resistance is encountered.
Circular Aviation Slide Rule
One of the most recognizable elements of the Navitimer is its circular aviation slide rule.
The concentric scales positioned around the outer dial create the technical appearance associated with the collection.
A slide rule is fundamentally a calculation scale rather than an additional mechanical complication within the movement.
Its presence therefore adds information to the dial without requiring another movement-driven hand or subdial.
Baton-Style Hour Markers
The main dial incorporates baton-style hour markers.
Their relatively simple shape helps distinguish the primary hour references from the denser numerical information surrounding the circular slide rule.
This separation is particularly important on the Navitimer because the outer portion of the dial contains considerably more information than a conventional chronograph.
Fluted Bezel
The watch incorporates a fluted bezel with a textured outer edge.
The grooves improve grip when handling the rotating outer assembly while also creating a recognizable visual detail around the case.
This structure complements the circular slide-rule system and distinguishes the Navitimer from sports chronographs using conventional elapsed-time bezels.
Aviation-Instrument Dial Architecture
The Navitimer’s visual identity comes from the combination of its circular slide rule, three chronograph registers, central hands, baton markers and 6 o’clock date display.
Rather than emphasizing a minimal dial, the design intentionally incorporates multiple scales and timing references.
The 43mm case provides the surface area required to organize these elements into distinct visual zones.
This makes the model particularly different from simpler three-hand or date-only automatic watches.
Product Specifications
Item Specification
Factory BLS Factory
Brand Breitling
Collection Navitimer
Model B01 Chronograph
Case Diameter 43mm
Movement 7750-Based B01-Style Automatic
Winding Automatic
Chronograph Mechanical
Dial Layout Three Registers
Date 6 O’Clock
Hour Markers Baton-Style
Outer Scale Circular Aviation Slide Rule
Bezel Fluted / Grip-Edge Design
Style Automatic Aviation Chronograph
Chronograph and Slide-Rule Layout
The mechanical chronograph and circular slide rule perform different roles.
The chronograph is movement-driven and provides mechanical elapsed-time measurement through the central chronograph hand and corresponding registers.
The slide rule, by contrast, consists of calibrated scales around the dial and does not represent an additional movement complication.
Combining both systems creates the information-rich layout traditionally associated with the Navitimer design.
Wearing and Care Advice
Protect the 7750-based automatic chronograph movement from heavy impacts and strong magnetic fields.
Operate the chronograph controls normally and avoid applying excessive force if a pusher does not respond as expected.
The circular slide-rule and fluted bezel assembly should also be operated gently to avoid unnecessary wear.
Use a clean microfiber cloth for routine exterior cleaning.
No confirmed water-resistance specification was provided, so intentional water exposure is not recommended without appropriate pressure testing.
Frequently Asked Questions
What size is the BLS Factory Breitling Navitimer B01?
The supplied case diameter is 43mm.
What movement does this version use?
It uses a 7750-based automatic chronograph movement with a B01-style configuration.
Is the movement an original Breitling B01?
No such claim is made. The supplied information specifically identifies it as a 7750-based movement modified toward a B01-style configuration.
Does this Navitimer have a date display?
Yes. The supplied configuration places the date at 6 o’clock.
What is the circular scale around the dial?
It is the Navitimer’s characteristic circular aviation slide rule, which provides a calculation scale around the dial.
How many chronograph subdials are there?
The supplied configuration uses a three-register chronograph layout.
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